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JOURNALS // Uchenye Zapiski Kazanskogo Universiteta. Seriya Fiziko-Matematicheskie Nauki // Archive

Uchenye Zapiski Kazanskogo Universiteta. Seriya Fiziko-Matematicheskie Nauki, 2024 Volume 166, Book 2, Pages 250–261 (Mi uzku1664)

$\mathbb R$-linear conjugation problem on the unit circle in the parabolic case

S. V. Rogozin, L. P. Primachuk, M. V. Dubatovskaya

Belarusian State University, Minsk, 220050 Belarus

Abstract: A solution to the $\mathbb R$-linear conjugation problem (Markushevich boundary value problem) on the unit circle was proposed. This problem is analogous to the vector-matrix Riemann boundary value problem with the coefficient degenerating in the parabolic case (the coefficient is a triangular matrix function). A complete description of the factorization of the matrix coefficient was provided. Its partial indices were calculated. The method used is based on G.N. Chebotarev’s algorithm and has been developed in a series of author's articles. The resulting factorization confirms the solvability of the $\mathbb R$-linear conjugation problem on the unit circle in the parabolic case.

Keywords: $\mathbb R$-linear conjugation, parabolic case, factorization of matrix functions, G.N. Chebotarev’s algorithm, partial index.

UDC: 512.643.8, 517.954, 517.968

Received: 10.04.2024
Accepted: 02.05.2024

DOI: 10.26907/2541-7746.2024.2.250-261



© Steklov Math. Inst. of RAS, 2024